144 0001888265 XXXXXXXX LIVE 0001921865 ASP Isotopes Inc. 001-41555 2200 ROSS AVENUE SUITE 4575E DALLAS TX 75201 (214) 4328219 Moore Duncan DIRECTOR Common Stock Independent Trading Group (ITG) Inc.

33 Yonge Street Suite 420 Toronto A6 M5E 1G4

11642 62633.96 125903447 04/16/2026 NASDAQ Common Stock 11/12/2025 Acquired as compensation --Restricted Stock Award Issuer N 25469 11/12/2025 Equity Compensation Y The sale of shares reported in this Form 144 was sold on the date indicated pursuant to a Rule 10b5-1 trading plan and includes an amount for the purpose of satisfying the Reporting Person's income tax liabilities resulting from the quarterly vesting of a previously granted restricted stock award pursuant to an issuer equity incentive plan. The Aggregate Market Value of the shares to be sold is based on the closing market price of $5.38 on April 15, 2026. 04/17/2026 12/31/2025 /s/ Duncan Moore